We are a division of the Synoptics Group, founded in 1985 by imaging experts from the University of Cambridge. Synoptics is owned by Scientific Digital Imaging plc. At Synbiosis we are passionate about making colony counting and zone analysis easier. That’s why we have developed products specifically designed to automate colony counting and inhibition zone measurement, to relieve you of the tedium involved with these repetitive manual tasks.

Glossary definition of SRID – Single Radial Immunodiffusion

Definition of SRID - Single Radial Immunodiffusion

Radial Immunodiffusion is a technique used extensively for the quantitative estimation of antigens.

Antibody of known specificity is distributed evenly in an agar gel and a sample containing the antigen of interest is placed in a well within the gel. Antigen then diffuses radially from the well and a precipitin ring forms at the point of antibody-antigen equilibrium. Antigen concentrations are determined by measuring the diameter of precipitin rings and extrapolating using standard curves.